There were 7,611 households out of which 34.30% had children under the age of 18 living with them, 52.20% were married couples living together, 16.50% had a female householder with no husband present, and 26.90% were non-families. 24.30% of all households were made up of individuals and 11.70% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.13. In the county, the population was spread out with 26.90% under the age of 18, 10.10% from 18 to 24, 27.00% from 25 to 44, 21.70% from 45 to 64, and 14.30% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.00 males. For every 100 females age 18 and over, there were 94.20 males.

The median income for a household in the county was $27,055, and the median income for a family was $32,147. Males had a median income of $27,367 versus $18,307 for females. The per capita income for the county was $13,365. About 18.10% of families and 23.30% of the population were below the poverty line, including 31.90% of those under age 18 and 23.90% of those age 65 or over.

^"Walnut Grove." First Impressions. Mississippi State University, February 2008. 0 (3/21). Retrieved on August 14, 2010. "Looking at the MDA profile, the population growth is impressive (year 2000 – 488, year 2006 – 1,424). However, we learned that most of this population growth has been due to the location and annexation of the Walnut Grove Youth Correctional Facility."